1  #pragma GCC system_header
       2  #define NULL (void *) 0
       3  #define ONEP (void *) 1
       4  #define RETURN return NULL
       5  
       6  extern void sysbar (unsigned char *);
       7  
       8  unsigned char *
       9  sysfn1 (void *p)
      10  {
      11     unsigned char *uc = ONEP;
      12     uc = ONEP;
      13     sysbar (ONEP);
      14     return ONEP;
      15  }
      16  
      17  extern void sysbar2 (int);
      18  
      19  int
      20  sysfn2 (void)
      21  {
      22    int a = NULL;
      23    a = NULL;
      24    sysbar2 (NULL);
      25    return NULL;
      26  }
      27  
      28  int
      29  sysfn3 (void)
      30  {
      31    RETURN;
      32  }